Vent grid and electronic apparatus employing the same

• US 7,277,300 B2
• Filed: 07/27/2005
• Issued: 10/02/2007
• Est. Priority Date: 03/01/2005
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Nagase, Kenji, Taya, Kazuaki, Sakamoto, Shigeo
• Primary Examiner(s): Reichard; Dean A.
• Assistant Examiner(s): Levi; Dameon E.
• Application Number:
  US11/189,929
• Publication Number:
  US 20060196692A1
• Time in Patent Office: 797 Days
• Field of Search: 361/692, 361/800, 361/693, 361/752, 361/753, 361/799, 361/816, 361/818, 174/350, 174/355, 174/357
• US Class Current: 361/816
• CPC Class Codes: G06F 1/18 Packaging or power distribution
• CPC Class Codes: G06F 1/20 Cooling means
• CPC Class Codes: H05K 9/0041 Ventilation panels having provisions for screening

Abstract

A vent grid has parallel first electrically-conductive members and parallel second electrically-conductive members intersecting with the first electrically-conductive members. The intersection between the first and second electrically-conductive members is forced to have a larger cross-sectional area. The characteristic impedance thus increases. The electric current flowing through the first and second electrically-conductive members turns over at the boundary between the intersection and the first and second electrically-conductive members. The flow of the electric current is in this manner interrupted. Accordingly, the vent grid fails to induce electromagnetic wave. Moreover, the electrically-conductive piece is merely located at a corner of the opening. Decrease in the percentage of the opening is thus suppressed to the utmost per a unit area. A sufficient airflow can be established through the vent grid. Decrease in the cooling efficiency and performance can be suppressed.

Claims

1. An enclosure comprising a vent grid fitted in a wall of the enclosure, said vent grid comprising:

parallel first electrically-conductive members extending in a first direction, said first electrically-conductive members having a constant cross-sectional area;

parallel second electrically-conductive members extending in a second direction, intersecting with the first direction, so as to intersect with the first electrically-conductive members, said second electrically-conductive members having a constant cross-sectional area; and

an electrically-conductive piece located at a corner of an opening surrounded by adjacent ones of the first electrically-conductive members and adjacent ones of the second electrically-conductive members, said electrically-conductive piece connecting first and second electrically-conductive members, intersecting with each other at the corner, to each other,

wherein the electrically-conductive piece extends along the first and second electrically-conductive members from an apex of the corner.

2. The vent grid according to claim 1, wherein said electrically-conductive piece is integral to the first and second electrically-conductive members.

3. An electronic apparatus comprising:

an enclosure enclosing electronic circuit elements of the electronic apparatus;

a vent grid fitted in a wall of the enclosure, said vent grid comprising;

parallel first electrically-conductive members extending in a first direction, said first electrically-conductive members having a constant cross-sectional area;

parallel second electrically-conductive members extending in a second direction, intersecting with the first direction, so as to intersect with the first electrically-conductive members, said second electrically-conductive members having a constant cross-sectional area; and

an electrically-conductive piece located at a corner of an opening surrounded by adjacent ones of the first electrically-conductive members and adjacent ones of the second electrically-conductive members, said electrically-conductive piece connecting first and second electrically-conductive members, intersecting with each other at the corner, to each others

wherein the electrically-conductive piece extends along the first and second electrically-conductive members from an apex of the corner.